How are leaf nodes and browse nodes different? How do I find out if my ASINs have leaf nodes?

The title kinda says it all.

We had a call with an SAS agent at amazon and they talked about leaf nodes and the massive impact they can have on visibility for listings. I understand they are a code on Amazon’s backend that corresponds to a browse node/category but that just because your listing has a browse node doesn’t inherently mean there’s a leaf node assigned. The absence of a leaf node is worth as much as 15% of a “listing grade” and can drastically affect sales. I’ve also heard you can have more than one leaf node if you ask.

However, I’ve asked for an update to leaf nodes and included a browse path for my desired leaf nodes and support redirects to changing my category. Furthermore, the report that indicated the presence of leaf nodes was only available through the SAS program and I don’t wanna pay $5k a month for one report.

Is there a place where I can find out if my listings have a leaf node and can anyone clarify how leaf nodes work?